Search
Module:
Directory

   Desktop Functions:

   Smart Device Functions:


Show Recent Changes
Subscribe (RSS)
Misc. Pages
Comments
FAQ
Helpful Tools
Playground
Suggested Reading
Website TODO List
Download Visual Studio Add-In

GetOpenFileName (comdlg32)
 
.
Summary
TODO - a short description

C# Signature:

[DllImport("comdlg32.dll", SetLastError=true, CharSet = CharSet.Auto)]
static extern bool GetOpenFileName([In, Out] OpenFileName ofn);

VB Signature:

<DllImport("comdlg32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Shared Function GetOpenFileName(<[In], Out> ByVal ofn As OpenFileName) As Boolean
End Function

F# Signature:

[<DllImport("comdlg32.dll", SetLastError = true)>]
extern bool GetOpenFileName (OpenFileName& ofn)

User-Defined Types:

OpenFileName

Alternative Managed API:

OpenFileDialog

Notes:

None.

Tips & Tricks:

Please add some!

Sample Code:

    ' Copyright
    ' Microsoft Corporation
    ' All rights reserved

    'typedef struct tagOFN {
    '  DWORD     lStructSize;
    '  HWND      hwndOwner;
    '  HINSTANCE     hInstance;
    '  LPCTSTR       lpstrFilter;
    '  LPTSTR    lpstrCustomFilter;
    '  DWORD     nMaxCustFilter;
    '  DWORD     nFilterIndex;
    '  LPTSTR    lpstrFile;
    '  DWORD     nMaxFile;
    '  LPTSTR    lpstrFileTitle;
    '  DWORD     nMaxFileTitle;
    '  LPCTSTR       lpstrInitialDir;
    '  LPCTSTR       lpstrTitle;
    '  DWORD     Flags;
    '  WORD      nFileOffset;
    '  WORD      nFileExtension;
    '  LPCTSTR       lpstrDefExt;
    '  LPARAM    lCustData;
    '  LPOFNHOOKPROC lpfnHook;
    '  LPCTSTR       lpTemplateName;
    '#if (_WIN32_WINNT >= 0x0500)
    '  void *    pvReserved;
    '  DWORD     dwReserved;
    '  DWORD     FlagsEx;
    '#endif // (_WIN32_WINNT >= 0x0500)
    '} OPENFILENAME, *LPOPENFILENAME;

    <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> _
    Public Class OpenFileName

        Public structSize As Integer = 0
        Public dlgOwner As IntPtr = IntPtr.Zero
        Public instance As IntPtr = IntPtr.Zero
        Public filter As String = Nothing
        Public customFilter As String = Nothing
        Public maxCustFilter As Integer = 0
        Public filterIndex As Integer = 0
        Public file As String = Nothing
        Public maxFile As Integer = 0
        Public fileTitle As String = Nothing
        Public maxFileTitle As Integer = 0
        Public initialDir As String = Nothing
        Public title As String = Nothing
        Public flags As Integer = 0
        Public fileOffset As Short = 0
        Public fileExtension As Short = 0
        Public defExt As String = Nothing
        Public custData As IntPtr = IntPtr.Zero
        Public hook As IntPtr = IntPtr.Zero
        Public templateName As String = Nothing
        Public reservedPtr As IntPtr = IntPtr.Zero
        Public reservedInt As Integer = 0
        Public flagsEx As Integer = 0

    End Class 'OpenFileName

    Public Class LibWrap
        'BOOL GetOpenFileName(LPOPENFILENAME lpofn);
        Declare Auto Function GetOpenFileName Lib "Comdlg32.dll" ( _
        <[In](), Out()> ByVal ofn As OpenFileName) As Boolean
    End Class 'LibWrap

    Private Function ShowOpen(Optional ByVal filter As String = ("All files" & ChrW(0) & "*.*" & ChrW(0)), _    
                  Optional ByVal title As String = "Open File Dialog...", _
                  Optional ByVal defext As String = "*", _
                  Optional ByVal path As String = "C:\") As String

        Try
        Dim ofn As New OpenFileName

        ofn.structSize = Marshal.SizeOf(ofn)
        ofn.filter = filter
        ofn.file = New String(New Char(256) {})
        ofn.maxFile = ofn.file.Length
        ofn.fileTitle = New String(New Char(64) {})
        ofn.maxFileTitle = ofn.fileTitle.Length
        ofn.initialDir = path
        ofn.title = title
        ofn.defExt = defext

        If LibWrap.GetOpenFileName(ofn) Then
            Console.WriteLine("Selected file with full path: {0}", ofn.file)
            Console.WriteLine("Selected file name: {0}", ofn.fileTitle)
            Console.WriteLine("Offset from file name: {0}", ofn.fileOffset)
            Console.WriteLine("Offset from file extension: {0}", ofn.fileExtension)

            Return ofn.file
        End If
        Catch ex As Exception
        Debug.Assert(False)
        Return System.String.Empty
        End Try

    End Function

F# Sample

type Flags =
   | OFN_ALLOWMULTISELECT = 0x00000200
   | OFN_CREATEPROMPT = 0x00002000
   | OFN_DONTADDTORECENT = 0x02000000
   | OFN_ENABLEHOOK = 0x00000020
   | OFN_ENABLEINCLUDENOTIFY = 0x00400000
   | OFN_ENABLESIZING = 0x00800000
   | OFN_ENABLETEMPLATE = 0x00000040
   | OFN_ENABLETEMPLATEHANDLE = 0x00000080
   | OFN_EXPLORER = 0x00080000
   | OFN_EXTENSIONDIFFERENT = 0x00000400
   | OFN_FILEMUSTEXIST = 0x00001000
   | OFN_FORCESHOWHIDDEN = 0x10000000
   | OFN_HIDEREADONLY = 0x00000004
   | OFN_LONGNAMES = 0x00200000
   | OFN_NOCHANGEDIR = 0x00000008
   | OFN_NODEREFERENCELINKS = 0x00100000
   | OFN_NOLONGNAMES = 0x00040000
   | OFN_NONETWORKBUTTON = 0x00020000
   | OFN_NOREADONLYRETURN = 0x00008000
   | OFN_NOTESTFILECREATE = 0x00010000
   | OFN_NOVALIDATE = 0x00000100
   | OFN_OVERWRITEPROMPT = 0x00000002
   | OFN_PATHMUSTEXIST = 0x00000800
   | OFN_READONLY = 0x00000001
   | OFN_SHAREAWARE = 0x00004000
   | OFN_SHOWHELP = 0x00000010

[<Struct>]
[<StructLayout(LayoutKind.Sequential)>]
type OpenFileName =
   val mutable lStructSize: int
   val mutable hwndOwner: nativeint
   val mutable hInstance: nativeint
   val mutable lpstrFilter: string
   val mutable lpstrCustomFilter: string
   val mutable nMaxCustFilter: int
   val mutable nFilterIndex: int
   val mutable lpstrFile: string
   val mutable nMaxFile: int
   val mutable lpstrFileTitle: string
   val mutable nMaxFileTitle: int
   val mutable lpstrInitialDir: string
   val mutable lpstrTitle: string
   val mutable Flags: Flags
   val mutable nFileOffset: int16
   val mutable nFileExtension: int16
   val mutable lpstrDefExt: string
   val mutable lCustData: nativeint
   val mutable lpfnHook: nativeint
   val mutable lpTemplateName: string
   val mutable pvReserved: nativeint
   val mutable dwReserved: int
   val mutable FlagsEx: int

let mutable ofn = OpenFileName ()
ofn.lStructSize <- Marshal.SizeOf (ofn)
//The first character of this buffer must be NULL if initialization is not necessary.
ofn.lpstrFile <- Char.MinValue.ToString () + new string (' ', 256)
ofn.nMaxFile <- ofn.lpstrFile.Length
ofn.lpstrFileTitle <- new string (' ', 64)
ofn.nMaxFileTitle <- ofn.lpstrFileTitle.Length
ofn.Flags <- Flags.OFN_FILEMUSTEXIST ||| Flags.OFN_PATHMUSTEXIST

if (GetOpenFileName (&ofn)) then
   Choice1Of2 ofn.lpstrFile
else
   Choice2Of2 (sprintf "GetOpenFileName failed with the error code: %d" (Marshal.GetLastWin32Error ()))

Sample code tiny c OR gcc Cygwin:

tcc (http://bellard.org/tcc/) command line to compile:

tcc -lcomdlg32 openfilename.c

./openfilename.exe is 2,048 bytes !!!

gcc (under cygwin) command line to compile:

gcc -Wall -Wl,--enable-stdcall-fixup -mnop-fun-dllimport -mwindows getopenfilename.c

./a.exe is 61,414 bytes !!!

#include <windows.h>

// tinycc: pull info from CYGWIN header /usr/include/w32api/commdlg.h
#ifdef __TINYC__
#define OFN_READONLY 0x1
#define OFN_OVERWRITEPROMPT 0x2
#define OFN_HIDEREADONLY 0x4
#define OFN_NOCHANGEDIR 0x8
#define OFN_SHOWHELP 0x10
#define OFN_ENABLEHOOK 0x20
#define OFN_ENABLETEMPLATE 0x40
#define OFN_ENABLETEMPLATEHANDLE 0x80
#define OFN_NOVALIDATE 0x100
#define OFN_ALLOWMULTISELECT 0x200
#define OFN_EXTENSIONDIFFERENT 0x400
#define OFN_PATHMUSTEXIST 0x800
#define OFN_FILEMUSTEXIST 0x1000
#define OFN_CREATEPROMPT 0x2000
#define OFN_SHAREAWARE 0x4000
#define OFN_NOREADONLYRETURN 0x8000
#define OFN_NOTESTFILECREATE 0x10000
#define OFN_NONETWORKBUTTON 0x20000
#define OFN_NOLONGNAMES 0x40000
#define OFN_EXPLORER 0x80000
#define OFN_NODEREFERENCELINKS 0x100000
#define OFN_LONGNAMES 0x200000
#define OFN_ENABLEINCLUDENOTIFY 0x400000
#define OFN_ENABLESIZING 0x800000
#define OFN_DONTADDTORECENT 0x2000000
#define OFN_FORCESHOWHIDDEN 0x10000000
#define OFN_EX_NOPLACESBAR 0x1
#define OFN_SHAREFALLTHROUGH 2
#define OFN_SHARENOWARN 1
#define OFN_SHAREWARN 0

typedef UINT_PTR (CALLBACK *LPOFNHOOKPROC) (HWND,UINT,WPARAM,LPARAM);

typedef struct tagOFNA {
     DWORD lStructSize;
     HWND hwndOwner;
     HINSTANCE hInstance;
     LPCSTR lpstrFilter;
     LPSTR lpstrCustomFilter;
     DWORD nMaxCustFilter;
     DWORD nFilterIndex;
     LPSTR lpstrFile;
     DWORD nMaxFile;
     LPSTR lpstrFileTitle;
     DWORD nMaxFileTitle;
     LPCSTR lpstrInitialDir;
     LPCSTR lpstrTitle;
     DWORD Flags;
     WORD nFileOffset;
     WORD nFileExtension;
     LPCSTR lpstrDefExt;
     LPARAM lCustData;
     LPOFNHOOKPROC lpfnHook;
     LPCSTR lpTemplateName;
     void *pvReserved;
     DWORD dwReserved;
     DWORD FlagsEx;
} OPENFILENAMEA,*LPOPENFILENAMEA;

#define OPENFILENAME OPENFILENAMEA
#define LPOPENFILENAME LPOPENFILENAMEA
#define GetOpenFileName GetOpenFileNameA

#endif

#ifdef __CYGWIN__
#include <commdlg.h>
#endif

// below adapted from: https://www.daniweb.com/software-development/cpp/code/217307/a-simple-getopenfilename-example

int main(int argc, char **argv) {
    char szFile[100];
    OPENFILENAME ofn;
    memset(&ofn, 0, sizeof (ofn));
    ofn.lStructSize = sizeof (ofn);
    ofn.hwndOwner = NULL;
    ofn.lpstrFile = szFile;
    ofn.lpstrFile[0] = '\0';
    ofn.nMaxFile = sizeof (szFile);
    ofn.lpstrFilter = "All\0*.*\0Text\0*.TXT\0";
    ofn.nFilterIndex = 1;
    ofn.lpstrFileTitle = NULL;
    ofn.nMaxFileTitle = 0;
    ofn.lpstrInitialDir = NULL;
    ofn.Flags = OFN_PATHMUSTEXIST | OFN_FILEMUSTEXIST;
    int i = GetOpenFileName(&ofn);
    return(i);
}

Contributed by John Refling

Documentation

Please edit this page!

Do you have...

  • helpful tips or sample code to share for using this API in managed code?
  • corrections to the existing content?
  • variations of the signature you want to share?
  • additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).

 
Access PInvoke.net directly from VS:
Terms of Use
Find References
Show Printable Version
Revisions